Bug 1310408 - Add a mochitest for batched consoleAPI calls. r=linclark;

MozReview-Commit-ID: HQTjOSDLMnN

devtools/client/webconsole/new-console-output/new-console-output-wrapper.js

@@ -108,6 +108,10 @@ NewConsoleOutputWrapper.prototype = {
   dispatchMessagesClear: function () {
     store.dispatch(actions.messagesClear());
   },
+  // Should be used for test purpose only.
+  getStore: function () {
+    return store;
+  }
 };
 
 function batchedMessageAdd(action) {